Sewing machine



July 10, 1923. 1,461,619 V J. KIEWICZ SEWING MACHINE Filed Sept. 18 1919 2 Sheets-Sheet 1 lnvenTov.

July 10, 1923.

SEWING MACHINE Filed Sept. 18 1919 Fig.4.

2 Sheets-Sheet 2 Inventor. John Kiewicg byimdsmwrw ATW 5 to the work;

Patented July 10, 1923.- r i I Unitas fer-Arse PATIENT orrice.

JOHN HEWIKZ, OF BOBTQN, HABSAUEUSETI'S, ASSIGNOR TO THE BEECE BUTTON HOLE MACHINE COMPANY, 013 BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE SEWING MACHINE.

- Application fled September 18, 1918. Serial No. 824,285

To all whom it may concern:

Be it known that I, Jorm Kmwroz, a citizen of the United States, residing at Boston, county of Sulfolk, State of Massachusetts, have invented an 1111 rovement in Sewing Machines, of which t e following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to sewing machines and particularly tofbuttonhole sewin machines of that type which are equippe with a thread-trimming mechanism carried by the work-holding means and arra d to cut the thread between the work an the workholding means at the end of .a stitching operation on a buttonhole.

The object of the invention is to provide an improved thread-trimming device which is simple in construction and accurate 1 in operation and which will cut the'thread close In order to give an understanding of my invention I have illustrated in the drawin? a selected embodiment thereof which wi 1 now be described, after which the novel features will be pointed out in the appended claims. r

Fig. 1 is a side view of a buttonhole sewing machine embodying mty invention;

Fig. 2 is a plan view 0 sewing machine including the clumpplate showing my improved thread-trimming device- Fig. 3 is a section on the line 3-3, Fig. 2' Fig. 4. is an underside view of the bed plate showing the actuator for the threadtrimming device.

Since my invention relates particularly to the thread-trimming means, I have not deemed it neceasa to illustrate herein a complete buttonho e sewing machine, but have simply shown in the drawings a sufficient portion of such. a machine to enable the invention to be understood.

My invention is herein shown as it might be applied to a buttonhole sewing machine of the well-known Reece type, exaim be of which may be seen in United States Patent No. 1,188,944 dated June 27,1916, or No. 1,361,871 dated Dec. 14,1920.

In the sewing machine herein illustrated, 1

indicates thebed plate portion of the frame from which rises the head or overhan ing arm 2 that carries the upper thread-ham ing in the we a. portion of the.

tters mechanism herein shown in the form of a reciprocatmg eye-pointed needle 3 carriedbr the, usual reciprocating needle bar 4.

The upper threadhandling mechanism (lo-operates with an under threadhandlin" mechanism of usual type which is carried on a rotatable turret 8 that is mounted for turnin movement in the depending portion 9 of t e frame, said turret carrying at its upper end the throat-plate 10 which is revi ed with the aperture 11 throu h w ioh the upper needle 3 andthe need e of the under thread mechanism 0 crate and through which the under three extends as it Basses to the work.

he work which is shown in dotted lines at w, Fig. 1, is carried by work-holding means comprising a clam plate 5 slidably mounted in ways 6 formed in the bed. late 1 and work clamps 7 ivoted to the 0 amp plate and by which e work'is clamped thereagainst. The'clamp plate moves back and forth in the ways 6 during thefsewing on the buttonhole and is provided with a sewing opening 40 through which the sewing is done. The movement of the clamp plate 6 is derived iroma feed cam 14 as usual 1n buttonhol sewing machines of this type. These buttonhole sewing machines are usually constructed so that when they are set in o oration the work clamps 7 are first clamp againstfthe work in thereby clamping the latter to the clamp plate 5 and then the buttonhole cutter; if one is used, is actuated to cut the buttonhole, after which the clamp plate is moved by the cam 14 toward the front of the machine to carry the work from buttonhole-cutting to stitching position The stitch-formin mechanism is then set in operation and e clamp plate continues its movement first in one direction and then 'in the other tocause the stitching to be rformed down one side of the huttonho e and then back along the other side. When the buttonhole is finished, the stitchforming mechanism is brought to rest with the needle 3 raised and the work clamps 7 are then released to unclamp the work, after which the clamp plate is given a movement to carry the work from stitching to buttonhole-cutting position. The entire machine is then automatically brought'to rest.

My resent improvement relates to a novel thre trimming device which is carried by the clamp plate 5 and is adapted to operate 34 designates a pull-0E leversimilar to G4. Inasewin machine that mentioned in my above mentioncd c pending application which is actuated by the lever 27 to pull off a length of under thread before the thread cutter is operated. This pull-0E lever 34, however, forms no part of my present invention. g

My improved thread cutter is very simple in construction and positive in operation and by means of it the thread wil be cut close to the under side of the work. I I claim: 1. In a sewin machine adapted to sew a short seam and t en come to rest, the combination with stitch-forming mechanism including a throat-plate, of a clamp plate on which the work is supported, means or moving the clamp plate and stitch-forming mechanism relative to each other, said clamp plate having a shearing edge on its workreceiving face situated at one side. of the throat-plate, a cutting member pivotally mounted on the clamp plate and havinga cutting ed e, turning movement of the cut ting member carrying said cutting edge across the throat-plate so thatit enga es the threads extendi v therefrom and pu 5 0d a length of three and then across the shearing edge thereby to sever the thread, and means operative atthe end of the stitching operation to actuate said cutting means. 2. In a sewinghmachine adapted to sew a short seam and en come to rest,.the combination with stitch-forming mechanism including a throat-plate, of a clamp late on which the work is supported, a cam or moving the clamp plate and stitch-formim mecshanism relative to each other, sai

,clamp plate having a shearing edge on its work receiving: face at one side of the throat-plate, a cutting, member pivotally mounted on the-clamp plate an'd'having a cutting edge, turning movement of the cutting member carrying the cutting ed e across the throat-plate and then across t a shearing edge, and means associated with said cam for actuating the cutter at the end of the stitching o oration whereby a length of thread is first rawn ofi b the cutter and then said threadis severed c ose to the work.

3. In a sewing machine, the combination with stitcdrforming mechanism, of aclamp plate on which the. work is clamped, said clamp plate having a sewing opening, a shearing block provided with a shearing edge secured to the clamp plate, a cutting member pivoted to the clamp plate and operating to cut the thread between the work and the clamp plate, a cam member for moving the clamp plate relative to the stitchforming mechanism, and means associated with said cam member and operating independently of the movement of the clamp plate for actuating the cutting member at the end of the stitching operation.

the combination with a clamp p -ate-"on which. the work is supported and which is provided with a sewhis opening, ofstitch-formlng mechanism including a throatqilate situated beneath the sewing opening, means for moving the clamp plate and stitch-forming mechanism relativ'e to each other, said :clamp plate having a shearing edge at one side of the throat-plate, acutting member movably mounted on the clamp. plate and provided with a cutting edge, and means operative at the end of the stitching operation to move said cutting member so as to carry its cutting edge first across the throat-plate and then over the shearing edge whereby said cutting edge will draw out a length of stay-cord from the throat-plate and then shear said cord close to the work.

5. In a sewing machine the combination with a clamp plate on which the work is clamped and provided'with a sewing 0pening of stitch-forming mechanism including a t roat-platc a shearing block adjustabl mounted on the clamp plate and provided with a shearing edge situated at one side of the throat plate, a cutting member movably mounted on the upper side of the clamp plate and situated between the latter and the work, said cutting member having a cuttin edge movable across the throat plate and toward and from the shearing edge, and means to actuatesaid cuttin member.

6. In a sewing machine, t e combination with stitch forming mechanism including a throat plate on which the work is supported, means for moving the clamp plate and stitch-formin mechanism relative to each other, said 0 amp plate having a shearing edge on its upper face on one side of the throat plate, a cutting member on the upper slCle of the clamp late and provided with a the throat plate and the shearing edge and co-operating with the throat plate to draw oii' a length of thread and with the shearin edge to cut the thread between the work and the clamp plate, and devices operating independently of the relative movement betwen the work clamp and stitch-forming mecha nism to actuate the cutter.

7. In a sewing machine, the combination with stitch-forming mechanism, of a clamp plate on which the work is clamped, said clamp having a sewing opening, a shearing block provided with a shearing edge secured to the clamp plate, a cutting member pivoted to the clamp plate and operating to cut the thread between the work and the clamp plate a cam member for moving the clamp plate relative to the stitch-forming mechanism, an actuating member rigid with the cam member and means actuated thereby to operate the cutting member at the end of the stitching operation.

cutting edge move is across and beyond both 78. In a sewing machine, the combination .with stitch-forming mechanism, of eelemp plate on which the work is clamped, said clamp plate having a, sewing opening, a.

5 shearing block providedwith a shearing edge secured to the clamp plate, a cutting member pivoted to the clamp plate and operating to cut the thread between the work and the clamp plate, a cam member for moving the clamp plate relative, to the stitch forming mechanism and lever devices actuated thereby for giving movement to the cut- "ting member. 7

In testimony whereof, I have signed my name to this specification. I

JOHN KIEVVICZw 

